喜界島および南大東島の離水サンゴ礁段丘上に発達した土壌の遊離酸化鉄の結晶化指数による年代推定 Application of the Crystallinity Ratio of Free Iron Oxides for Dating Soils Developed on the Raised Coral Reef Terraces of Kikai and Minami-Daito Islands, Southwest Japan

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著者

    • 前島 勇治 MAEJIMA Yuji
    • 日本学術振興会特別研究員筑波大学応用生物化学系 Research Fellow of the Japan Society for the Promotion of Science. Institute of Applied Biochemistry, University of Tsukuba

抄録

Absolute ages of soils developed on the raised coral reef terraces in Kikai Island in the Ryukyus, Southwest Japan were estimated by using the mean rate of tectonic uplift and glacio-eustatic curve during late Quaternary in the previous paper. In order to estimate the soil age of other areas where the similar soils as those existed in Kikai Island were formed by using the index of soil age, which was highly correlated with some physico-chemical properties of soil itself, total iron (Fe<sub>t</sub>), iron and aluminum extractable by dithionite-citrate (Fe<sub>d</sub>, Al<sub>d</sub>) and by acid ammonium oxalate (Fe<sub>o</sub>, Al<sub>o</sub>) were determined for all horizons of the six profiles in Kikai Island. The results obtained are as follows:<br>The crystallinity ratio of free iron oxides [(Fe<sub>d</sub>-Fe<sub>o</sub>)/Fe<sub>t</sub>] gradually increased with the stage of soil development, while the activity ratio (Fe<sub>o</sub>/Fe<sub>d</sub>) decreased. There was a highly positive correlation between the soil age and (Fe<sub>d</sub>-Fe<sub>o</sub>)/Fe<sub>t</sub>. By using this relationship, the ages of Minami-Daito Island soils, Lateritic Red soil and Lateritic Yellow soil whose age had not been determined, were estimated from the mean values of (Fe<sub>d</sub>-Fe<sub>o</sub>)/Fe<sub>t</sub>, as 500±60 ka and 630±110ka, respectively. Therefore, it was concluded that the crystallinity ratio of free iron oxides could be a good index of the degree of soil development and age of Red-colored soils.

収録刊行物

  • 第四紀研究

    第四紀研究 41(6), 485-493, 2002-12-01

    Japan Association for Quaternary Research

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各種コード

  • NII論文ID(NAID)
    10010428061
  • NII書誌ID(NCID)
    AN0034136X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    04182642
  • NDL 記事登録ID
    6373276
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-67
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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